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(No Model.)

E. A. WADHAMS. LUBRIGATING CUP.

Patented Apr. 21,l 1885.

mvsssss: Y

rrrcngl- EDWARD A. WADHAMS, OF MILWAUKEE, WISCONSIN, ASSIGNOR OF ONE-A HALF IO E. ELDRED MAGIE, OF SAME ILAOE.

LUBRICATBNG-CUP.

SPECIFICATION forming part of Letters Patent No. 316,202, dated April 21, 1885.

Application tiled January 22,1885. (No model.)

To all whom t may concern:

Be it known that l, EDWARD A. WAD- HAMS, of Milwaukee, in the county of Milwaukee and State of Visconsin, have invented certain new and useful Improvements in Lubricating-Cups; and I do hereby declare that the following is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon, which forms a part of this specification.

The object of my invention is in that class of cups employing a close-fitting piston for feeding the lubricant to relieve the piston of atmospheric pressure upon its upper face when the cup has been emptied, and thereby to facilitate the refilling of the cup.

The accompanying drawing represents a vertical medial section of my improved cup.

A A is the cup proper inverted, or, more properly, closed at the top and open at the bottom, about the edge of which it isexter- 2 5 nally threaded to engage with the internallythreaded upturned rim or flange c c upon the removable base or bottom B. The base B is provided in the usual manner with a threaded neck, E, for attaching the cup to the bearing 3o to be lubricated. It has a passage, b, through which the lubricant is fed to the bearing.

D isa closetting plunger or piston provided With the stem C, which passes through and has a bearing in the top of cup A.

A spiral spring, S, surrounds the stem C, and bears at the top against thetop of the cup, and at the bottom against the upper face of the piston D.

The top of the cup may be squared at c a 4o and milled at d d to assist in unscrewing the cup A from its bottom B.

To assist in compressing the spring S and withdrawing the piston D into the cup A for the purpose of filling, the protruding end of the stem O may be provided with a knob or handle, G.

As heretofore constructed, this class of cups which employ a piston for feeding the lubricant to the bearing have been made integral with the bottom, with a lid or cover detacha- 5o ble therefrom in the region marked d clin the drawing. With these cups the following serious difficulty is encountered: Vhen the lu bricant has been expelled and the piston forced to the bottom of the cup, as shown in the drawing, it is impossible or extremely difficult to lift or withdraw the piston for the purpose of refilling the cup, owing to the atmospheric pressure upon the upper face of saidpiston and the exclusion of air from the under 6o side thereof.

In case the piston could be removed without introducing air under the piston, so much force is required that the piston-stem is eX- tremely liable to be bent or broken. In practice, however, the cup is unscrewed or removed from the bearing to which it is attached every time it needs relling. In this way a vent is given through the passage b to the under side of the piston; but the operation 7o is inconvenient, and all of the lubricant in said passage is removed, necessitating its replacement before the lubricant can act upon the bearing.

My improved cup can be easily and quickly 7 5 relilled by unscrewing the cup at c c from its bottom B without molesting the lubricant left in and filling the passage b, and without the slightest danger of bending, breaking, or inj uring the piston or its stem C.

Afew turns of the screw-threaded cup A admits air about the base of the piston, thereby relieving the same of the unequal atmospheric pressure upon its two faces, and permitting of its easy withdrawal into the cup for 8 5 purposes of refilling.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, in a lubricator, ofthe 9o base B, the inverted cup A, detachable at the bottom from said base B, and piston D, substantially as and for the purposes set forth.

2. The combination, in a lubricator, of the inverted cup A, detachable base B, piston D, provided with stems C, and actuating-spring S, substantially as and for the purposes set In testimony thatIolaim the foregoing as my 1o forth. own I afx my signature in presence of two 3. The combination, in a1ubrioator,of the Witnesses.

inverted cup A, externally threaded at the 5 bottom, the base B, provided with the inter- EDWARD A. WADHAMS.

nally-threaded upturned flange c c and neck f E, the feeding-passage b, and the automatic Witnesses:

feeding-piston D, substantially as and for the CEAS. L. Goss,

purposes set forth. GEORGE GoLL. 

